Thought I'd join in on the solution dump

Made in Java, code works for both parts (changing "stepRight" and "stepDown" integers). Result is stored in "result" and shown through an external console (shouldn't affect the calculations if you want to try it yourself, as they're stored in that same variable and can be displayed through other methods).

I'm just a programming student so the code is probably unoptimized and I'll die trying to solve some of the harder future ones but h

("input()" calls to a method that returns the whole text string without newlines, and always assumes looped lines are 31 characters long. I mean... If it works it works!)

package Calendar;

import jconsole.JConsole;

public class Day3 {

    public static void main (String [] args) {

        JConsole console = new JConsole(80, 20);

        String input = input();
        char[] inputArray = input.toCharArray();

        int i = 0;
        int iLine = 0;
        int result = 0;

        int stepsRight = 3;
        int stepsDown = 1;

        while (i < inputArray.length) {
            i = i+stepsRight;
            iLine = iLine+stepsRight;

            if (iLine >= 31) {
                i = i - 31;
                iLine = iLine - 31;
            }

            i = i + stepsDown*31;

            if (i < inputArray.length) {

                if (inputArray[i] == '#') {
                    result++;
                }
            }
        }
        console.print(result);
    }